655390552321 has 2 divisors, whose sum is σ = 655390552322. Its totient is φ = 655390552320.

The previous prime is 655390552303. The next prime is 655390552331. The reversal of 655390552321 is 123255093556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 605198423025 + 50192129296 = 777945^2 + 224036^2 .

It is a cyclic number.

It is not a de Polignac number, because 655390552321 - 2¹¹ = 655390550273 is a prime.

It is not a weakly prime, because it can be changed into another prime (655390552301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327695276160 + 327695276161.

It is an arithmetic number, because the mean of its divisors is an integer number (327695276161).

Almost surely, 2^655390552321 is an apocalyptic number.

It is an amenable number.

655390552321 is a deficient number, since it is larger than the sum of its proper divisors (1).

655390552321 is an equidigital number, since it uses as much as digits as its factorization.

655390552321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1215000, while the sum is 46.

The spelling of 655390552321 in words is "six hundred fifty-five billion, three hundred ninety million, five hundred fifty-two thousand, three hundred twenty-one".